Ring book mechanism



April 23, 1940.'

K. HANDLER RING BOOK MECHANISM Filed July 28, 1936 Inventor K- Hand [67"Attorney Patented Apr. 23, 1940 UNITED STATES PATENT OFFICE Messrs.

Percy Jones (Twinlock) Limited,

Bechenham, Kent, England Application July 28,

1936, Serial N0. 92,957

In Austria. February 29, 1936 3 Claims.

The application of the lever action for the closing mechanism instead ofpress studs, offers a very great advantage.

Further according to the invention, a spring is 5 also provided by whichthe lever, the press stud or the like, is supported so as to prevent thesame from shaking.

The drawing illustrates by way of example a construction of mechanicalactuating device according to the invention.

In the drawing:

Fig. 1 is a perspective view of the ring book mechanism.

Fig. 2 a longitudinal section of the mechanism on line A-A of Fig. 3,when the mating prongs are closed to form rings and with the cover plateomitted, and Fig. 3 a cross section thereof on line B-B of Fig. 2.

Fig. 4 is a longitudinal section of the mechanism on the line -0 of Fig.5 with the mating prongs parted so as to open the rings, and Fig. 5 across section thereof on line DD of Fig. 4.

Figs. 6 and 7 represent the opening and closing levers.

The ring book mechanism consists of the usual resilient base plate I inwhich a pair of toggle connected ring plates 2 are inserted. The prongs3 are fixed to the ring plates 2, and the 3%) prongs are parted and therings formed by the prongs opened when the ring plates 2 are raisedagainst the influence of the resiliency of the base plate I (Figs. 4 and5) and the prongs are brought together and the rings closed when thering plates are pressed down (Figs. 2 and 3). A cover 4 is further laidover the ring plates, and connected to the base plate I. The ends of thering plates 2 are provided with slots 5 for the engagement of bent overprojections 6 of an open- 40 ing lever I and a closing lever 8 while thelower end of the opening lever I carries an extension ,9 directedupwardly, another similar extension I0 directed downwardly is providedon the closing lever 8 approximately in its center. To prevent shakingof the levers,-one or both levers, I and 8, is or are provided with aspring I I, which presses against the lower side thereof and is withadvantage bent out from the material of the base plate I. In orderbetter to distinguish the different duties of both levers, these may beeither in different colors or distinguished by markings or the like forthe opening and the closing respectively. The operation of the device,according to the invention, is as follows:

When it is desired to open the ring book device for the purpose, forinstance, of filing or removing sheets, pressure is simply exerted onthe end of the opening lever 1 shown at the right hand end of Figs. 1, 2and 4. This causes lever I to roll on the spring II and extension 9,which directly bears against the lower sides of the ring plates 2,thereby forces the latter upwards, which after overcoming thespringiness of the base plate I, rise to the upper position (Figs. 4 and5) and thereby part the prongs 3 and open the rings. When it is desired.to again close the device, pressure is exerted on the closing lever 8shown at the left hand end of Figs. 1, 2 and 4, whereupon the said leverrolls on the spring I I and its extension II! presses on the ring plates2, and after overcoming the springiness of the base plate I, the plates2 are caused to spring back to their lower position (Figs. 2 and 3),whereupon at the same time the prongs 3 are brought together in the formof a closed ring.

Having thus described the invention, I claim:

1. In ring book mechanism, a resilient base plate, a pair ofring-carrying toggle plates supported by said base plate to havemovement toward and away from the base plate and arranged with slotsadjacent one end, a closing lever at said end having a convex undersurface on which it rolls, two fingers which extend from one end of saidlever and which are adapted to pass through the slots in the toggleplates and to act as supports about which the lever swings, the oppositeend of the lever extending from one end of the base plate and toggleplates, and a third finger on said lever adapted to engage the uppersurfaces of said toggle plates and to exert a downward pressure thereonwhen the said opposite end of the lever is pushed outwards and downwardsto rock the lever.

2. In ring book mechanism according to claim 1, a part of the base platebelowthe closing 1ever severed to form a leaf spring which serves as aresilient support for the convex under surface of the closing lever.

3. In book mechanism according to claim 1, a resilient member carried bythe base plate and serving as a support for the convex under surface ofthe closing lever.

KOLOMAN HANDLER.

